Rotary expansion-engine.



Patented Mar. 10, 19141 3 SHEETS-SHEET l.

R. EISERMANN & J. LEHNE. ROTARY EXPANSION ENGINE.

APPLICATION FILED 11111.26, 1911.

R.EISERMANN & J. LEHNB.

ROTARY EXPANSION ENGINE.

APPLICATION FILED JAN.26,1911.

Patented Mar. 10, 1914.

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lll ST-S RUDOLF EISERMANN, OF BERLIN, ANI) JOSEF LEI-INE, OF

CHARLOTTENBURG, GER- T/IANY, ASSIGNORS T0 THE AMERICAN ROTARY MACHINE COMPANY, OF NEW YORK, N. Y.

ROTARY EXPANSION-ENGINE.

insonne.

Specification of Letters Patent.

ateiited Mal. 1), 1914i.

Application filed January 26, 1911. Serial No. 604,880.

T0 all y'whom it may concern.'

lle i l known that we, RUDOLF EIsnnuANN and Josnr lacrima, subjects el King olf Prussia and the Grand Duke of Hesse, respecw tively, residing at ller-lin and Charlottenburg, rcsi'iectively, lrussia, Germany, have invented certain new and useful Improvements in Rotary Expansion-Engines, oil which the following is a specification.

The present invention relates to a rotary engine working' with expansion.

riccording lo the invention the control lingv device olf the engine, serving at thc same time as starting valve, is so arranged. that the engine will, on being started, run under full charge so that it will sla rt at any position ol the piston, and only then the expansion cut. oli will be adjusted. This controlling mechanism, which may at the Same time be arranged for reversing the engine preferably made in form of a sleeve valve arranged in the hollow spindle of the piston drum and adjustable by being either displaced axially or turned around its axis so that a very simple constructimi is obtained.

lu the accompanying' drawing two constructional. forms of the invention are shown in use with pneumatic rock drills.

Figure l `is a longitudinal section through the one constructional form of the engine along' line 1 1 in Fig. 2. Fig. 2 is a transverse section along' the line 2 2 in Fig. 1. Fig. 3 is a section along the line 3-3 in Fig. l and Fig. -lz is a section along' the line -l il in Fig. l. Fig. 5 is a part of Fig. l on an enlarged scale. Fig. G shows a section along Vthe circumferential surface of the piston drum, spread out in the plane oi the drawing. F G"L shows the correspondingly developed controlling surfaces, which for salte of greater clearness have been projected on a cylinder of the same diameter as the piston drum. Figs. 6b, G, (3d, Ge show the same developed surfaces as Fig'. 6 at other positions oil the controlling sleeve. Fig'. 7 is a longgfitudinal section through another constructional form of the engine. Fig. S is an end view thereof on a smaller scale. Figs. 9a, 9D and 9 show the controlling mechanism ot the engine according' to T and 8 on an enlarged scale in the positions for at rest, full charge and expansion cut ell.

According to Figs. 1-6 the engine has a drum 2 litted on a hollow shaft l within a fasing 3. In a radial slot in this drum a slide (3 is axially movable guided between parallel cani surfaces 4l, 5 ot the heads il of the casing. llf'mfling' chambers are termed between the end surfaces oit the drum 2 and the cam surfaces il, ln the hollow sha'lt l, the rotation oil. which is transmitted. in known manner by means ol a sun and planet gear 2i), 30, 3l. to the drill spindle 7, is arranged a controlling sleeve valve S) which does not particil'iale in the rotation, and can be axially displaced by means of a lever ll acting on a pin l0. This lever 1l is secured to a spindle 1Q leading out ol the casing, to the outer end oit' which spindle a hand lever lil is attached. .lhe inside cavity of the hollow sleeve 9 is divided into two chambers by a parti( ion llfl, the one of which chambers 115 peri'nanently communicates with the com pressed-air supply passages 11.7, the other 1G with the exhaust: 1S through a central bore 18 ol the 'central pinion 29 oil the sun and planet gear. ll`ron1 the pressure chamber 15 ol sleeve valve l) the compressed air passes through openings '1.9, 2() in the sleeve 9 to the passages 2l., 22 on the outer controlling surlace of the sleeve i), while the exhaust chamber 1G o'l5 the sleeve permanently co1nmunicates through an opening' S22-3 with a passage Qfl; on the outside ol" the sleeve. To the passages 21., Qflf, correspond openings Q5, 2G, 27, 28 in the hollow shaft. l communieating with the working chambers between the drum Q and the cam surfaces 4l, and 5, which openings may according to the adjustn ment o t the sleeve 5l communicate with the passages in the same or also be completely cut olli' from a communication with the compressed air supply or the exhaust by being covered by the bearing surfaces between the said passages. The openingsl Q5 and 28 lead directly into the working chambers, and the openings 2G and 27 also communicate therewith by intermediate passages Q6 and 27 cut in the outer surface of the hollow shaft l. The several connections are evident from the diagram of the developed controlling surfaces `in Figs. (3, 6b, G, (3, 6". ln these the parts shaded by single lines indicate the bearing surfaces of the sleeve valve 9, the parts shaded by cross lines the (awnings in the hollow shaft 1 oil the piston drum 2, the not shaded parts the passages iu the sleeve valve. For facilitating the explanation thc controlling surface oit the sleeve valve has been divided in Figs. 6, Gb, Gc, G and G" by dotted lines into a numher of zones O, 1, 1l, 1H, 1V, V, V1, V11, VH1, 1X, X. At the position according to Fig. 6a the opening 25 will be in zone 1, the openings 27 and 25 in Zone V, 2S in Zone V11. All four openings are covered by the bearing surfaces of the controlling sleeve; the machine is at rest. `When sleeve 9 is moved into the position, Fig. Gb, the openings 25 will be in Zone 11, the openings 27 and 2G in Zone Vl, the opening 28 in Zone VH1. As the Zones 1l. and VH1 meet with the passages 21 and 22 which are in communication with the pressure medium supply, and Zone Vl corresponds with the passages 24 connnunicating with the exhaust 13', 1S, compressed air will pass through opening 28 into the one working chamber. ln consequence of its action on the slide 6 the drum 2 will begin to move in the direct-ion of arrow B. The shaft 1 with its openings 25, 26, 27, 23 participates in this movement. The engine now works under full charge, that means to say the openings and 2S communicate almost permanently with the compressed air supply; only at the dead center position of the one end of the piston the respective admission port, say 25 at the position of the piston shown in Fig. G, will be shut olf as else at this position the driving medium would freely flow through the working chamber from pressure into the exhaust pipe, if as shown the elevated level part of the cam surface has not such a circumferential ,extension that it can simultaneously close both openings say 25, 26. lVhen the sleeve 9 is moved on in the direction of the arrow A into the position according to Fig. 6, the opening 25 will come into zone 111 and the opening 28 into Zone 1X, while the openings 27 and 26 remain in the wide zone V1. The engine continues to revolve in the same direction, but now with expansion cut off, as the openings 25 and 23 are covered during the greater part of their circumferential travel and give an admission for a short time only. lVhen the sleeve 9 is moved contrary to the direction of arrow A into the initial posit-ion shown in Fig. 6a, the engine will be stopped. W hen the sleeve is moved on in the same direction, Fig. Gd, the openings 25 will reach zone 0, the openings 27 and 26 the zone 1V, the opening 28 the zone V1, in other words the openings 25 and 28 which communicated at first with the pressure passages 21 and 22, now communicate with the exhaust passage 24, and openings 27 and 26, which communicated with the exhaust passage 24, now communicate with the pressure passage 21, so that the engine will revolve in the reverse sense and at first also under full charge. 1f the sleeve is still further moved contrary to the direction of arrow A, Fig. 6, the openings 27 and 26 will reach Zone lll, while 25 and 28 remain in Zone O and V1,

so that the engine revolves to the leftwith expansion cut off.

The engine according to Figs. 7-9 corresponds with the engine according to Figs. l-G with regard to the principle of the power engine. Here, however, no sun and planet gear is represented, whereas also the controlling mechanism is of another design. The latter has here the form of a sleeve valve 32, which may be turned to a certain extent by means of bevel gea-rs 33, 34, the latter of which lits on a spindle 35 provided with a hand lever 36. rlhe sleeve valve 32 is arranged within the hollow shaft 1 in a bush 37. 1t has three openings 38, 39, 40 for each side of the engine, while the bush has two corresponding groups of openings 41, 42. ln the walls of the hollow shaft 1 are formed two similar wide openings 43,

fliich lead into the corresponding working chambers of the engine formed between the cam surfaces 4, 5 and the drum 2. In Figs. 9, 9b and 9C one set of openings in the sleeve valve 32, bush 37 and hollow shaft 1 is represented, the openings of the other set being arranged accordingly but at angles of 180O relatively to those represented. At the pgsition shown in Fig. 9a, which is a section through sleeve valve, bush and hollow shaft on an enlarged scale, the engine will be at rest, because the communication from the cavity of the sleeve valve is completely cut oiby bush 37, as all openings in the sleeve valve are covered by this bush. l/Vhen the sleeve valve 32 is moved into the position according to Fig. 9b the openings 39 and 42 communicate on the one hand and the openings 38 and 41 on the other. lWhen the hollow shaft 1 revolves, its opening 43 will therefore communicate through opening 41 with the cavity of the sleevevalve, fro-m the moment in which the edge 44 begins to clear the opening 41, as shown in the drawing, When the edge 45 of openings 43 has after a certain angle of rotation reached the edge 47 of the opening 41 and therefore again closed this opening, there will nevertheless remain a communication between the cavity of the sleeve valve and the opening 43 through opening 42 until the edge 45 of the hollow shaft has reached the closing edge 48 of the opening 42. The communication thus exists during that angle of rotation which the edge 45 describes from the position shown to the closing edge 48 of kopening 42. This does indeed not give a quite full charge but the cut o travel is so long, that the cut oi travels of hoth sides of the engine, alternating by 180, will overlap, so that always one of the sides of the engine will receive a charge as required to admit of its starting from any position. 1f the sleeve valve is turned until the opening 42 is closed by the edge 46 of opening 39, as l shown in Fig. 90, there only remains the com- CII munication through 38, ll. The cnt oll therefore only depends on the duration ol lthe communication between ll and 43, with other words it corresponds to the angle of rotation which the edge l5 describes from 'the position shown to the edge i-T ol' open- :ing tll. The engine will work with expansion.

te claim:

l. rotary expansion engine, comprising` a casing having end walls forming parallel lam surfaces, a rotary member in, the casing forming working chambers between its ends and the cam surfaces of the casing, axially movable pistons in the rotary member engaging said snrlaces and arranged to worl; in periods alternating by an angle el 1S() degrees, and means to admit tlnid to each end ot the rotary member during sneh angle ot revolution that the admission periods ot the ends overlap each other.

Q. A rotary expansion engine coniprising a casing having end walls forming parallel cam surfaces, a rotary drum in the casing forming working chambers between its ends and the cam snrt'aces ol the casing, an axially movable slide .mounted in a radial slot in the drum and engaging said cam sinf't'aees, and means to admit llnid to each working chamber during snch an angle olI revolntion that the adn'iission periods to both chan'ihcrs overlap each other.

3. A rotary expansion engine comprising a casing having end walls forming parallel cain surfaces, a rotary drum in the casing forming working chambers between its ends and the ends ot' the casing, a hollow shaft carrying said drum and having a port therein near each side olE the drum, a valve in the hollow shal't having a plurality of ports corresponding to each port ol' the shal't, a stationary bnsh interposed between the valve and shaft and provided with a plurality of ports arranged to connect one or more ports ol the valve with the ports ol the shalt at each side of the drinn, for the purpose specitied.

4l. A rotary expansion engine comprising a casing having end walls :forming parallel cani snriliaces, a rotary drum in the casing lorining working chanibers between its ends and the ends ol the casing, an axially niovable slide mounted in a radial slot in the drum and engaging said :am surfaces, a hollow shalt carrying said drum and having a wide port near each side ot the drnm7 a valve in said shaft and provided with a large and two small ports near each side of the drnm, a stationary bush interposed between said valve and shat't and having two ports located near each end o'l the drnm7 the relative arrangement ot said ports being snch that none, or both, or only the large port of the valve is in commnnieation with the interior ot the `valve and the port in the shaft being oli' snch circnmlerential length that in a certain position it commnnicates simultaneously with both ports lin the bnsh, l'or the purpose specilied.

ln testimony wllereoil we allix our signalures in presence of two witnesses.

'RUDOLF El'SERh/IA NN. JOSEF LEI-INE. lVitneSses A n eUs'r InAU'rMANN lVoLnnMan Hanru.

this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. C. 

